<<<<The carbon footprint of producing 2.2 pounds of marijuana indoors, one study says, is equivalent to driving across country seven times. Yet almost no one is pushing for cleaner sun-grown weed as state officials make rules for legal growing operations.

Marijuana growing is not a green industry.

Done mostly indoors in Washington, pot production often uses hospital-intensity lamps, air conditioning, dehumidifiers, fans and carbon-dioxide generators to stimulate plants and boost their potency.

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